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Old 05-31-2013, 06:42 PM
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DaveInDenver DaveInDenver is offline
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Location: Larimer County
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That chart is probably overly dramatic (and they conveniently sell tranny coolers), but the fundamentals seems true that you don't want the ATF going beyond about 225F.

The thermal expansion coefficient of materials is constant, most aluminums being about 12 to 13 ppm (e.g. microinch) per F and irons are typically about 6 to 7. My main worry would be ruining the fluid more than the marginally worse metal expansion. Joining dissimilar metals is a bad idea but unfortunately common on our junk.
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Last edited by DaveInDenver; 05-31-2013 at 07:06 PM.
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